Question

Three bodies have equal masses m. Body A is solid cylinder of radius R, body B is a square lamina of side R, and body C is a solid sphere of radius R. Which body has the smallest moment of inertia about an axis passing through their centre of mass and perpendicular to the plane ? (in case of lamina)

• A. A
• B. B
• C. C
• D. A and C both

Answer 1

The correct option is B B

The moment of inertia about of A, B and C are $\frac{M{R}^2}{2},\frac{M{R}^2}{6}and\frac{2}{5}M{R}^2$ respectively. The least value is for the square lamina.